Damping system for inlet and outlet lines of a plunger pump

Abstract

The embodiment of the application discloses a kind of damping systems of plunger pump import and export pipeline, belong to oilfield water injection development technical field.The system includes: plunger pump, first pressure stabilizer, second pressure stabilizer and damping device;One end of the plunger pump is connected with import pipeline, the other end is connected with export pipeline;Wherein, the import pipeline is provided with the first pressure stabilizer, and the export pipeline is provided with the second pressure stabilizer and damping device.The system reduces the vibration of plunger pump import and export pipeline, prolongs the repair-free cycle of plunger pump import and export pipeline, and increases the injection time rate of plunger pump.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield water injection development, and in particular to a damping system for inlet and outlet pipelines of a plunger pump. BACKGROUND

[0002] The plunger pump is widely used in the technical field of oilfield water injection development, but due to high discharge pressure and harsh working conditions, the inlet and outlet pipelines of the plunger pump are prone to large vibration, which in turn causes repeated cracking of the pipeline welds, reduces the operating efficiency of the plunger pump, and affects the progress of oilfield water injection development.

[0003] In related technologies, a pressure stabilizer is usually added to the inlet and outlet pipelines of the plunger pump, and the pressure stabilizer has an air bag inside. When the pressure rises, the air bag is squeezed and shrinks; when the pressure decreases, the air bag expands to supplement the pressure, thereby stabilizing the pressure and reducing the vibration of the inlet and outlet pipelines of the plunger pump.

[0004] However, the inner cavity of the pressure stabilizer in related technologies is small, and the air bag is prone to aging and air leakage, resulting in poor damping effect of the inlet and outlet pipelines of the plunger pump, which in turn leads to a short maintenance-free cycle of the inlet and outlet pipelines of the plunger pump, high maintenance cost, and serious impact on the injection rate of the plunger pump. SUMMARY

[0005] In view of this, the present application provides a damping system for inlet and outlet pipelines of a plunger pump, which can effectively reduce the vibration of the inlet and outlet pipelines of the plunger pump and increase the injection rate of the plunger pump.

[0006] Specifically, the technical solutions include the following:

[0007] The damping system for the inlet and outlet pipelines of the plunger pump provided in the present application embodiment comprises a plunger pump, a first pressure stabilizer, a second pressure stabilizer, and a damping device.

[0008] One end of the plunger pump is connected with an inlet pipeline, and the other end is connected with an outlet pipeline.

[0009] The first pressure stabilizer is arranged on the inlet pipeline, the second pressure stabilizer and the damping device are arranged on the outlet pipeline.

[0010] In some embodiments, the first pressure stabilizer comprises a first tank body, a liquid level detection member, a gas supplement assembly, and a vent valve.

[0011] The liquid level detection member is arranged inside the first tank body.

[0012] The gas supplement assembly and the vent valve are both arranged outside the first tank body and communicate with the inside of the first tank body.

[0013] In some embodiments, the height of the air supplement assembly is higher than the height of the upper limit of the liquid level detection member, and the height of the vent valve is lower than the height of the lower limit of the liquid level detection member.

[0014] In some embodiments, the air supplement assembly comprises an air supplement member and a communication pipeline.

[0015] The air supplement member is in communication with the interior of the first tank body through the communication pipeline.

[0016] In some embodiments, in the direction from the first tank body to the air supplement member, the communication pipeline is sequentially provided with a first valve, a pressure relief mechanism and a second valve.

[0017] The height of the pressure relief mechanism is lower than the height of the first valve and the height of the second valve.

[0018] In some embodiments, the pressure relief mechanism comprises a third valve, a flow guide pipeline and a liquid sensor.

[0019] One end of the flow guide pipeline is connected to the first valve, and the other end is connected to the second valve.

[0020] The third valve is arranged on the flow guide pipeline, and the liquid sensor is arranged in the flow guide pipeline.

[0021] In some embodiments, the first pressure stabilizer further comprises an automatic control mechanism.

[0022] The automatic control mechanism is signal connected to the liquid sensor, the air supplement member, the first valve, the second valve and the third valve, respectively.

[0023] In some embodiments, the second pressure stabilizer comprises a second tank body, a first pressure relief pipeline and a second pressure relief pipeline.

[0024] The first pressure relief pipeline and the second pressure relief pipeline are oppositely arranged on both sides of the second tank body and are in communication with the interior of the second tank body.

[0025] In some embodiments, the first pressure relief pipeline comprises a first pressure relief sub-pipeline and a second pressure relief sub-pipeline, the second pressure relief sub-pipeline is located in the interior of the second tank body, one end of the first pressure relief sub-pipeline penetrates through the side wall of the second tank body and is in communication with the second pressure relief sub-pipeline, and the extension direction of the first pressure relief sub-pipeline and the extension direction of the second pressure relief sub-pipeline form a preset angle.

[0026] The second pressure reduction pipeline comprises a third pressure reduction sub-pipeline and a fourth pressure reduction sub-pipeline, the fourth pressure reduction sub-pipeline is located inside the second tank body, one end of the third pressure reduction sub-pipeline penetrates through the side wall of the second tank body and communicates with the fourth pressure reduction sub-pipeline, and the extending direction of the third pressure reduction sub-pipeline and the extending direction of the fourth pressure reduction sub-pipeline form a preset angle.

[0027] In some embodiments, the damping device comprises a first accumulator, a second accumulator and a connecting member;

[0028] The first accumulator and the second accumulator are connected with the connecting member and oppositely arranged on two sides of the connecting member.

[0029] The connecting member is a pipe body, the connecting member is provided with a first through hole and a second through hole, the first accumulator communicates with the inside of the connecting member through the first through hole, the second accumulator communicates with the inside of the connecting member through the second through hole, and a plurality of arc protrusions are arranged on the inner wall of the connecting member.

[0030] The technical scheme provided by the embodiment of the application has at least the following beneficial effects:

[0031] The damping system of the inlet and outlet pipelines of the plunger pump provided by the embodiment of the application reduces the vibration of the inlet pipeline of the plunger pump by arranging the first pressure stabilizer on the inlet pipeline of the plunger pump, and reduces the vibration of the outlet pipeline of the plunger pump by arranging the second pressure stabilizer and the damping device on the outlet pipeline of the plunger pump. The triple damping design of the first pressure stabilizer, the second pressure stabilizer and the damping device greatly reduces the vibration of the inlet and outlet pipelines of the plunger pump, prolongs the repair-free cycle of the inlet and outlet pipelines of the plunger pump, reduces the maintenance cost, and increases the injection time rate of the plunger pump. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1 A structure diagram of a damping system of inlet and outlet pipelines of a plunger pump provided by the embodiment of the application;

[0034] Figure 2 A structure diagram of a first pressure stabilizer in a damping system of inlet and outlet pipelines of a plunger pump provided by the embodiment of the application;

[0035] Figure 3A structure diagram of a second pressure stabilizer in a damping system of an inlet and outlet pipeline of a plunger pump is provided in the embodiments of the present application.

[0036] Figure 4 A structure diagram of a damping device in a damping system of an inlet and outlet pipeline of a plunger pump is provided in the embodiments of the present application.

[0037] The reference signs in the drawings represent the following:

[0038] 1-plunger pump;

[0039] 2-first pressure stabilizer; 21-first tank body; 22-liquid level detection member; 23-air supplement assembly; 231-air supplement member; 232-communication pipeline; first valve-2321; pressure relief mechanism-2322; 23221-third valve; 23222-flow guide pipeline; 23223-liquid sensor; second valve-2323; 24-vent valve; 25-automatic control mechanism;

[0040] 3-second pressure stabilizer; 31-second tank body; 32-first pressure reduction pipeline; 321-first pressure reduction sub-pipeline; 322-second pressure reduction sub-pipeline; 33-second pressure reduction pipeline; 331-third pressure reduction sub-pipeline; 332-fourth pressure reduction sub-pipeline;

[0041] 4-damping device; 41-first energy accumulator; 42-second energy accumulator; 43-connection member, 431-first through hole, 432-second through hole, 433-arc-shaped protrusion;

[0042] 5-inlet pipeline;

[0043] 6-outlet pipeline;

[0044] The specific embodiments of the present application have been shown in the above drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present application.

[0046] In the embodiments of the present application, unless explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0047] In the description of the present application, the description of the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the embodiments of the present application.

[0048] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as generally understood by those of ordinary skill in the art. Some technical terms appearing in the embodiments of the present application are explained below.

[0049] In the process of oilfield development, water injection development is an important measure to supplement formation pressure and improve oil recovery. Plunger pumps are widely used in the field of oilfield water injection development technology, but due to the high pressure of the liquid discharged by the plunger pump and the harsh working conditions, the inlet and outlet pipelines of the plunger pump are prone to have a problem of large vibration, which causes the welding joints of the inlet and outlet pipelines to repeatedly crack. Once the welding joints of the inlet and outlet pipelines of the plunger pump crack, the pump needs to be stopped for maintenance, which reduces the injection rate of the plunger pump and the operation efficiency of the plunger pump, and seriously affects the progress of the oilfield water injection development.

[0050] In the related art, through field detection analysis, it is found that the main reason for the vibration of the plunger pump is that the liquid flow sucked and discharged by the plunger pump during operation generates pressure pulses due to the periodic changes of pressure and flow, and then the pressure of the inlet and outlet pipelines is unstable, causing the vibration of the inlet and outlet pipelines. Therefore, relevant personnel usually add a pressure stabilizer to the inlet and outlet pipelines of the plunger pump. The pressure stabilizer has an air bag inside. When the pressure rises, the air bag is squeezed and shrinks; when the pressure decreases, the air bag expands to supplement the pressure, thereby stabilizing the pressure and reducing the vibration of the inlet and outlet pipelines of the plunger pump. However, the inner cavity of the pressure stabilizer in the related art is small, and the air bag is prone to aging and air leakage, which leads to poor vibration reduction effect of the inlet and outlet pipelines of the plunger pump, and further leads to short maintenance-free cycle and high maintenance cost of the inlet and outlet pipelines of the plunger pump, which seriously affects the injection rate of the plunger pump.

[0051] To solve the technical problems in the related art, the embodiment of the present application provides a damping system for an inlet and outlet pipeline of a plunger pump, which can reduce the vibration of the inlet and outlet pipeline of the plunger pump, prolong the repair-free cycle of the inlet and outlet pipeline of the plunger pump, and increase the injection rate of the plunger pump.

[0052] Figure 1 A structural schematic diagram of the damping system for the inlet and outlet pipeline of the plunger pump is provided in the embodiment of the present application. Referring to Figure 1 The damping system for the inlet and outlet pipeline of the plunger pump comprises a plunger pump 1, a first pressure stabilizer 2, a second pressure stabilizer 3, and a damping device 4.

[0053] One end of the plunger pump 1 is connected with an inlet pipeline 5, and the other end is connected with an outlet pipeline 6;

[0054] The first pressure stabilizer 2 is arranged on the inlet pipeline 5, and the second pressure stabilizer 3 and the damping device 4 are arranged on the outlet pipeline 6.

[0055] Referring to Figure 1 The sizes of the inlet pipeline 5 and the outlet pipeline 6 are the same, and the axis of the inlet pipeline 5 and the axis of the outlet pipeline 6 are located on the same straight line.

[0056] Therefore, the damping system for the inlet and outlet pipeline of the plunger pump provided in the embodiment of the present application can reduce the vibration of the inlet pipeline of the plunger pump by arranging the first pressure stabilizer 2 on the inlet pipeline 5 of the plunger pump 1, and further reduce the vibration of the outlet pipeline of the plunger pump by arranging the second pressure stabilizer 3 and the damping device 4 on the outlet pipeline 6 of the plunger pump 1. The triple damping design of the first pressure stabilizer 2, the second pressure stabilizer 3, and the damping device 4 greatly reduces the vibration of the inlet and outlet pipeline of the plunger pump, prolongs the repair-free cycle of the inlet and outlet pipeline of the plunger pump, reduces the maintenance cost, and increases the injection rate of the plunger pump.

[0057] The structure of the damping system for the inlet and outlet pipeline of the plunger pump provided in the embodiment of the present application is further described as follows:

[0058] Figure 2 A structural schematic diagram of the first pressure stabilizer in the damping system for the inlet and outlet pipeline of the plunger pump provided in the embodiment of the present application is provided. Referring to Figure 2 In some embodiments, the first pressure stabilizer 2 comprises a first tank body 21, a liquid level detection member 22, a gas supplement assembly 23, and a vent valve 24.

[0059] The liquid level detection member 22 is arranged inside the first tank body 21; the gas supplement assembly 23 and the vent valve 24 are both arranged outside the first tank body 21 and communicate with the inside of the first tank body 21.

[0060] The liquid level detecting member 22 is arranged inside the first tank body 21 to measure the liquid level inside the first tank body 21; the air charging assembly 23 is arranged to charge air into the first tank body 21; and the vent valve 24 is arranged to vent the liquid inside the first tank body 21.

[0061] In some embodiments, the air charging assembly 23 is arranged above the upper limit of the liquid level of the liquid level detecting member 22, and the vent valve 24 is arranged below the lower limit of the liquid level of the liquid level detecting member 22.

[0062] The air charging assembly 23 is arranged above the upper limit of the liquid level of the liquid level detecting member 22 to prevent liquid from flowing into the air charging assembly before the liquid level reaches the upper limit of the liquid level detecting member; and the vent valve 24 is arranged below the lower limit of the liquid level of the liquid level detecting member 22 to vent the liquid inside the first tank body 21 when the pump is stopped or reversed.

[0063] In some embodiments, the air charging assembly 23 is arranged below the top of the first tank body 21 to prevent air leakage of the air charging assembly 23 or too fast rising of the liquid level to fill the internal space of the first tank body 21, and to avoid invalidation of the pressure stabilizing function of the first pressure stabilizer 2.

[0064] In some embodiments, referring to Figure 2 , the air charging assembly 23 comprises an air charging member 231 and a communication pipeline 232, and the air charging member 231 is in communication with the inside of the first tank body 21 through the communication pipeline 232.

[0065] The air charging member 231 charges air into the inside of the first tank body 21 through the communication pipeline 232 to form an air space similar to an air bag above the liquid level inside the first tank body 21 to store and release energy, to offset the pulse impact of the inlet liquid flow pressure, and to reduce the vibration amplitude of the inlet pipeline of the plunger pump.

[0066] In some embodiments, referring to Figure 2 , the communication pipeline 232 is sequentially provided with a first valve 2321, a pressure relief mechanism 2322 and a second valve 2323 in the direction from the first tank body 21 to the air charging member 231.

[0067] The pressure relief mechanism 2322 is arranged below the first valve 2321 and the second valve 2323.

[0068] In actual operation, sometimes the plunger pump inlet pressure will suddenly rise, at this time the liquid level in the first tank 21 will rise rapidly and exceed the upper limit of the liquid level detection piece, in order to avoid the first tank 21 from losing pressure stabilization due to being filled with liquid, the pressure relief mechanism 2322 needs to be set below the height of the first valve 2321 and the height of the second valve 2323, so that the communication pipeline 232 at both ends of the pressure relief mechanism 2322 forms a U-shaped tube-shaped pipeline structure, which can accommodate more overflow liquid and further prevent the overflow liquid from entering the air supplementing piece 231.

[0069] In some embodiments, referring to Figure 2 , the pressure relief mechanism 2322 includes a third valve 23221, a flow guide pipeline 23222, and a liquid sensor 23223.

[0070] Wherein, one end of the flow guide pipeline 23222 is connected with the first valve 2321, and the other end is connected with the second valve 2323; the third valve 23221 is arranged on the flow guide pipeline 23222, and the liquid sensor 23223 is arranged in the flow guide pipeline 23222.

[0071] By arranging the liquid sensor 23223, it is used to detect whether there is liquid flowing through the flow guide pipeline 23222, when liquid flows into the flow guide pipeline 23222, the third valve 23221 is opened, so that the liquid flows out of the flow guide pipeline 23222, to avoid the air supplementing piece 231 from being ineffective due to water ingress.

[0072] In some embodiments, referring to Figure 2 , the first pressure stabilizer 2 further includes an automatic control mechanism 25.

[0073] Wherein, the automatic control mechanism 25 is signal connected with the liquid sensor 23223, the air supplementing piece 231, the first valve 2321, the second valve 2323 and the third valve 23221 respectively.

[0074] That is, the automatic control mechanism 25 can receive the data sent from the liquid level detection piece 22 and the air supplementing assembly 23, and can also send instructions to the liquid level detection piece 22 and the air supplementing assembly 23 to control the liquid level detection piece 22 and the air supplementing assembly 23 to work; at the same time, the automatic control mechanism 25 can control the opening and closing of the first valve 2321, the second valve 2323 and the third valve 23221.

[0075] Specifically, the liquid level detection member 22 measures the liquid level in real time and sends the measurement result to the automatic control mechanism 25. When the liquid pressure rises and causes the liquid level to rise and exceed the upper limit of the height of the liquid level detection member 22, the automatic control mechanism 25 receives the data from the liquid level detection member 22, controls the first valve 2321 and the second valve 2323 to open, and controls the air supplement member 231 to start at the same time, so that the gas is filled into the first tank body 21 through the communication pipeline 232 until the liquid level is lowered by the gas; when the liquid level is lowered and reaches the lower limit of the height of the liquid level detection member, the automatic control mechanism 25 receives the data from the liquid level detection member 22, controls the first valve 2321 and the second valve 2323 to close, and controls the air supplement member 231 to close at the same time, so that the liquid level rises. When the liquid pressure at the inlet of the plunger pump suddenly rises, the liquid level rises rapidly to the position of the air supplement assembly 23, the liquid flows into the communication pipeline 232 and flows through the liquid sensor 23223, the liquid sensor 23223 transmits data to the automatic control mechanism 25, and the automatic control mechanism 25 controls the third valve 23221 to open and controls the first valve 2321 to close.

[0076] In some embodiments, the automatic control mechanism 25 is also connected with a remote central control system signal, so as to send an alarm indication to the central control system in the case of receiving the data of the liquid sensor 23223.

[0077] It can be understood that when the liquid enters the air supplement assembly 23, on-site operation is required by the relevant personnel to eliminate the fault.

[0078] In some embodiments, the internal hollow space volume of the first tank body 21 can be FS (the product of the plunger diameter and the stroke), see Table 1. For example, for a plunger pump with a plunger diameter of 75 mm or 80 mm and a stroke length of 180 mm, the internal hollow space volume of the first tank body 21 ranges from 2.38 L to 3.62 L.

[0079] Table 1: Calculation table of the internal cavity volume range of the air pack at the inlet of the plunger pump

[0080]

[0081] In the process of designing the volume of the first tank body 21, the compressibility of air volume and the water solubility of components such as oxygen and carbon dioxide also need to be considered. For example, the volume of the first tank body 21 can be designed as 18 L.

[0082] Figure 3 A structure diagram of a second pressure stabilizer in a damping system of a plunger pump inlet and outlet pipeline provided in an embodiment of the present application. Referring to Figure 3 In some embodiments, the second pressure stabilizer 3 includes a second tank body 31, a first pressure reduction pipeline 32, and a second pressure reduction pipeline 33.

[0083] The first pressure reduction pipeline 32 and the second pressure reduction pipeline 33 are oppositely arranged at two sides of the second tank body 31 and are both in communication with the inside of the second tank body 31.

[0084] When liquid flows in, the liquid can flow in from the first pressure reduction pipeline 32, pass through the inside of the second tank body 31, and flow out from the second pressure reduction pipeline 33.

[0085] Referring to Figure 3 , the extending direction of the first pressure reduction pipeline 32 is parallel to the extending direction of the second pressure reduction pipeline 33, and the extending direction of the first pressure reduction pipeline 32 is parallel to the extending direction of the second pressure reduction pipeline 33.

[0086] In some embodiments, referring to Figure 3 , the first pressure reduction pipeline 32 comprises a first pressure reduction sub-pipeline 321 and a second pressure reduction sub-pipeline 322, and the second pressure reduction sub-pipeline 322 is located inside the second tank body 31; one end of the first pressure reduction sub-pipeline 321 penetrates through the side wall of the second tank body 31 and is in communication with the second pressure reduction sub-pipeline 322; the extending direction of the first pressure reduction sub-pipeline 321 is at a preset angle with the extending direction of the second pressure reduction sub-pipeline 322.

[0087] The second pressure reduction pipeline 33 comprises a third pressure reduction sub-pipeline 331 and a fourth pressure reduction sub-pipeline 332, and the fourth pressure reduction sub-pipeline 332 is located inside the second tank body 31; one end of the third pressure reduction sub-pipeline 331 penetrates through the side wall of the second tank body 31 and is in communication with the fourth pressure reduction sub-pipeline 332; the extending direction of the third pressure reduction sub-pipeline 331 is at a preset angle with the extending direction of the fourth pressure reduction sub-pipeline 332.

[0088] Referring to Figure 3 , when the flow direction of the liquid is from the second pressure reduction sub-pipeline 322 to the first pressure reduction sub-pipeline 321, when the liquid flows into the second pressure reduction sub-pipeline 322, the flow direction of the liquid changes due to the preset angle between the extending direction of the third pressure reduction sub-pipeline 331 and the extending direction of the fourth pressure reduction sub-pipeline 332, thus the liquid flow pressure pulsation impact is offset for the first time; after the liquid enters the second tank body 31, the liquid flow pressure pulsation impact is offset for the second time through the change of the volume of the cavity of the second tank body 31; when the liquid flows into the first pressure reduction sub-pipeline 321, the flow direction of the liquid changes due to the collision of the liquid with the pipe wall and the preset angle between the extending direction of the first pressure reduction sub-pipeline 321 and the extending direction of the second pressure reduction sub-pipeline 322, thus the liquid flow pressure pulsation impact is offset for the third time and the fourth time. Therefore, the second pressure stabilizer 3 has the effect of damping the outlet pipeline 6 of the plunger pump, thus prolonging the maintenance-free period of the outlet pipeline 6 of the plunger pump, reducing the maintenance cost, and increasing the injection rate of the plunger pump.

[0089] Optionally, the preset angle can be 90°.

[0090] It should be noted that the second stabilizer is used for damping by mechanical principle, and is relatively effective for a plunger pump with a displacement of 30 m 3 / h and an outlet pressure of about 15 MPa, but for a plunger pump with a larger displacement and a higher pressure, the damping effect is not satisfactory by simply relying on the mechanical damping of the second stabilizer. Therefore, the damping system provided by the embodiment of the present application further comprises a damping device added to the outlet pipeline of the plunger pump, thereby forming a combined damping design of the damping device 4 and the second stabilizer 3.

[0091] Figure 4 The damping device 4 comprises a first accumulator 41, a second accumulator 42 and a connecting piece 43. Figure 4

[0092] The first accumulator 41 and the second accumulator 42 are both connected with the connecting piece 43 and are oppositely arranged on both sides of the connecting piece 43; the connecting piece 43 is a pipe body, the connecting piece 43 is provided with a first through hole 431 and a second through hole 432, the first accumulator 41 is in communication with the inside of the connecting piece 43 through the first through hole 431, the second accumulator 42 is in communication with the inside of the connecting piece 43 through the second through hole 432, and a plurality of arc protrusions 433 are arranged on the inner wall of the connecting piece 43.

[0093] The plurality of protrusions arranged on the inner wall of the connecting piece 43 can change the flow direction of the liquid when the liquid flows through the inside of the connecting piece 43, further reducing the liquid flow pressure pulsation impact, and being conducive to damping the outlet pipeline of the plunger pump.

[0094] In some embodiments, referring to Figure 4 , the number of arc protrusions 433 can be two, one of which is opposite to the first through hole 431, and the other of which is opposite to the second through hole 432, and the two arc protrusions 433 are oppositely arranged on both sides of the inner wall of the connecting piece 43, so that the flow passage of the connecting piece 43 forms an S shape, which can not only play a role in guiding and damping, but also can change the flow direction for damping purpose. At the same time, by designing the damping mode to be symmetrical up and down, the up and down impacts formed by the liquid flow pressure pulsation can be balanced and offset, and the damping effect is better.

[0095] Further, the central angle corresponding to the arc protrusion 433 opposite to the first through hole 431 can be 60 degrees, and the center line of the arc protrusion 433 points to the first accumulator 41; the central angle corresponding to the arc protrusion 433 opposite to the second through hole 432 can also be 60 degrees, and the center line of the arc protrusion 433 points to the second accumulator 42.​

[0096] Referring to Figure 4 When the liquid enters the damping device 4, the liquid flow collides with the arc-shaped protrusion 433 opposite to the first through hole 431, changes the flow direction, and directs the liquid flow pressure pulsation to the first accumulator 41, which first offsets part of the liquid flow pressure pulsation impact; the liquid flow changes the flow direction again after passing through the arc-shaped protrusion 433 opposite to the second through hole 432, and directs the liquid flow pressure pulsation to the second accumulator 42, which secondly offsets part of the liquid flow pressure pulsation impact, thereby reducing the liquid flow pressure pulsation impact, and facilitating the damping of the outlet pipeline of the plunger pump.

[0097] In some embodiments, the first accumulator 41 and the second accumulator 42 can be nitrogen accumulators.

[0098] The nitrogen accumulator accumulates and releases energy by the contraction and expansion of the nitrogen gas bag.

[0099] It should be noted that the embodiments of the present application can also select a nitrogen accumulator with appropriate parameters according to the displacement of the plunger pump and the size of the outlet liquid pressure, and the application range is wide.

[0100] In some embodiments, the nitrogen accumulator is designed as a flange connection, and a steel ring is sealed. The nitrogen accumulator and the flange are fastened by threads, and the connection is fixed by welding and secondary sealing.

[0101] Through this design, the maintenance and replacement of the nitrogen accumulator are facilitated, the risk of leakage is reduced, and the safety and service life of the damping device 4 are improved.

[0102] In actual use, before starting the plunger pump 1, it is necessary to check whether the performance of the plunger pump 1, the first pressure stabilizer 2, the second pressure stabilizer 3, the damping device 4, the inlet pipeline 5 and the outlet pipeline 6 is normal, so as to avoid safety accidents.

[0103] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0104] Furthermore, the terms "first", "second", etc. are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly pointing to the number of technical features indicated. Thus, features defined with "first", "second" etc. can include, explicitly or implicitly, one or more features. In the description of the application, the meaning of "plurality" is two or more, unless explicitly specified otherwise.

[0105] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the application be limited only by the scope of the claims, appropriately interpreted in light of the specification. The specification and examples are to be construed as merely illustrative of the present application.

[0106] It is to be understood that the application is not limited to the precise construction described in the specification above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims appended hereto.

Claims

1. A damping system for a plunger pump inlet and outlet line, characterized by, The system comprises a plunger pump (1), a first pressure stabilizer (2), a second pressure stabilizer (3) and a damping device (4); One end of the plunger pump (1) is connected with an inlet pipeline (5), and the other end is connected with an outlet pipeline (6); The first pressure stabilizer (2) is arranged on the inlet pipeline (5), and the second pressure stabilizer (3) and the damping device (4) are arranged on the outlet pipeline (6); The first pressure stabilizer (2) comprises a first tank body (21), a liquid level detection member (22), a gas supplement assembly (23), a vent valve (24) and a self-control mechanism (25); the setting height of the gas supplement assembly (23) is higher than the height of the upper limit of the liquid level of the liquid level detection member (22), and the setting height of the vent valve (24) is lower than the height of the lower limit of the liquid level of the liquid level detection member (22); The liquid level detection member (22) is arranged in the interior of the first tank body (21), and the gas supplement assembly (23) and the vent valve (24) are arranged outside the first tank body (21) and communicate with the interior of the first tank body (21); The gas supplement assembly (23) comprises a gas supplement member (231) and a communication pipeline (232); The gas supplement member (231) communicates with the interior of the first tank body (21) through the communication pipeline (232); In the direction from the first tank body (21) to the gas supplement member (231), the communication pipeline (232) is sequentially provided with a first valve (2321), a pressure relief mechanism (2322) and a second valve (2323); the height of the pressure relief mechanism (2322) is lower than the heights of the first valve (2321) and the second valve (2323); The pressure relief mechanism (2322) comprises a third valve (23221), a flow guide pipeline (23222) and a liquid sensor (23223); One end of the flow guide pipeline (23222) is connected with the first valve (2321), and the other end is connected with the second valve (2323); The third valve (23221) is arranged on the flow guide pipeline (23222), and the liquid sensor (23223) is arranged in the flow guide pipeline (23222); The self-control mechanism (25) is signal connected with the liquid level detection member (22), the liquid sensor (23223), the gas supplement member (231), the first valve (2321), the second valve (2323) and the third valve (23221) respectively. The liquid level detection piece (22) measures the liquid level in real time and sends the measurement result to the automatic control mechanism (25). When the liquid pressure rises and causes the liquid level to rise and exceed the upper limit of the height of the liquid level detection piece (22), the automatic control mechanism (25) receives data from the liquid level detection piece (22), controls the first valve (2321) and the second valve (2323) to open, and controls the air supplementing piece (231) to start at the same time, so that gas is filled into the first tank body (21) through the communication pipeline (232) until the liquid level is lowered by the gas pressure. When the liquid level decreases and reaches the lower limit of the height of the liquid level detection piece (22), the automatic control mechanism (25) receives data from the liquid level detection piece (22), controls the first valve (2321) and the second valve (2323) to close, and controls the air supplementing piece (231) to close at the same time, so that the liquid level rises. When the plunger pump inlet pressure suddenly rises, causing the liquid level to rise rapidly to the position of the air supplementing assembly (23), the liquid flows into the communication pipeline (232) and flows through the liquid sensor (23223), the liquid sensor (23223) transmits data to the automatic control mechanism (25), the automatic control mechanism (25) controls the third valve (23221) to open, and controls the first valve (2321) to close.

2. A dash system for a plunger pump inlet and outlet line as set forth in claim 1, wherein, The second pressure stabilizer (3) comprises a second tank body (31), a first pressure reducing pipeline (32) and a second pressure reducing pipeline (33). The first pressure reducing pipeline (32) and the second pressure reducing pipeline (33) are oppositely arranged on the two sides of the second tank body (31) and are in communication with the inside of the second tank body (31).

3. A dash system for a plunger pump inlet and outlet line according to claim 2, wherein, The first pressure reducing pipeline (32) comprises a first pressure reducing sub-pipeline (321) and a second pressure reducing sub-pipeline (322), the second pressure reducing sub-pipeline (322) is located in the inside of the second tank body (31); one end of the first pressure reducing sub-pipeline (321) penetrates through the side wall of the second tank body (31) and is in communication with the second pressure reducing sub-pipeline (322); the extension direction of the first pressure reducing sub-pipeline (321) and the extension direction of the second pressure reducing sub-pipeline (322) form a preset angle. The second pressure reducing pipeline (33) comprises a third pressure reducing sub-pipeline (331) and a fourth pressure reducing sub-pipeline (332), the fourth pressure reducing sub-pipeline (332) is located in the inside of the second tank body (31); one end of the third pressure reducing sub-pipeline (331) penetrates through the side wall of the second tank body (31) and is in communication with the fourth pressure reducing sub-pipeline (332); the extension direction of the third pressure reducing sub-pipeline (331) and the extension direction of the fourth pressure reducing sub-pipeline (332) form a preset angle.

4. The dash system of claim 1, wherein, The damping device (4) comprises a first accumulator (41), a second accumulator (42) and a connecting piece (43); The first accumulator (41) and the second accumulator (42) are connected with the connecting piece (43) and are oppositely arranged on the two sides of the connecting piece (43); The connecting piece (43) is a pipe body, the connecting piece (43) is provided with a first through hole (431) and a second through hole (432), the first energy accumulator (41) is communicated with the inside of the connecting piece (43) through the first through hole (431), the second energy accumulator (42) is communicated with the inside of the connecting piece (43) through the second through hole (432), and a plurality of arc protrusions (433) are arranged on the inner wall of the connecting piece (43).

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